For those of you familliar with the youtube fan fiction horror, this is a arena based on Thomas the Tank Engine: Shed 17
Of course there would be more rusted parts littering the area, plus scavengers and possibly some Shed 17 truthers (even though the documentary is already out). Contestants would be able to smash their way through the trains sheds, including Shed 17. Shed 17 of course would contain the boxes of failed experiments, that would release a mix of parts and blood when broken. Also there would be a surviving failure trying to break its way through the tank at the back of the room, which can be released, but would take off screaming into the main shed, damaging all those in it's way. Shed 4 would have the burnt and rusted remains of Gordon as well as a few skeletons. Crewe would have some rusted trains that can be smashed into scrap metal, however contestants will notice rusting green parts, as well as bloody bags marked "bio hazard" nearby. The ship would also make a scream every time it was hit with missles or bullets, until it explodes and sinks. Train parts can be seen near one of the cliffs, of course going near them would cause any vehicle (aside from Talon) to sink, then respawn (although damaged) on land. Timothy's shed would contain the dead/zombified Timothy, that would chase anyone near it screaming "I'll take you to the grave!" (reference to the ghost train story). The weather would mostly be dark clouds that would occasionally rain, sunlight would happen but only for a few seconds. There would also be old signs saying "forbidden", "do not enter", "Murderers", "Warning abominations", on most of the sheds, as well as graffiti all over the main research lab. Shed 1 is actually Sir Topham's office, enterable as well, but nothing too interesting, as most of the office had been vandalised, after being abandoned for some time.
As for thematic music if it would be used would be a mix of the intro to Shed 17, as well as some more dramatic music, simillar to what could be heard in Twisted Metal Black.